based on the science, a more nutritious mix. >> reporter: based on the science. is increase in plate waste. the only known study under the new guidelines contains a startling statistic. kids are throwing away twice as much food as last year. >> just plop the vegetables and food there, don't do anything else. waste goes up 97%. >> reporter: we visited a school in suburban chicago this month. where middle schoolers analyzed their waste and shocked to find 46 bocks of unopened pears. >> they're all unopened. >> reporter: week before, all 111 vegetable containers served were thrown away. >> schools tell us they're seeing a 50% increase in luncheon trash. >> it's too healthy. >> i try my hardest but it's not working. >> reporter: kids are bringing their own and only take vegetables and fruit when she makes them. >> a lot goes in the trash. >> reporter: the school is so secret it's hidden back here in a supply room behind a locked door and underneath one of the boxes. that ingredient? salt. >> the new school lunch rooms place limits on salt, ketchup and sugar. >> nobod